Valve for pneumatic cycle-tires



(No Model.)

R. MGGORD.

, VALVE FOR PNBUMATIG GYGLB TIRES. No. 544,487. Patented Aug. 13, 1895.

fLn ewes. @fm/enfer ,gaaf/M www UNTTED STATES PATENT Ormes.

RALPH MCOORD, OF SPRINGFIELD, ILLINOIS.

VALVE FOR PNEUMATIC CYCLE-TIRES.

sPEcIFrcAztIoNfQrming part of Letters Patent No. 544,487, dated August 13, 1895.

Application filed December l5, 1894. Serial No. 531,933. (No model.)

To all whom it may concern:

Be it known that I, RALPH MCOORD,a citizen of the United States, residing at Springfield, county of Sangamon, State of Illinois, have invented a new and useful Improvement in Valves for Pneumatic Cycle-Tires, o f which the following is aspecification.

The object of my invention is to provide a simple, durable valve, easy of adjustment and repair, and to avoid the objectionable features inherent in the ones now in use. These results I obtain by the mechanism shown in the accompanying drawings.

Figures 1 and 2 are external views, Fig. l being a side and Fig. 2 an end view. Fig. 3 is a sectional view throughY Z of Figs. l and 2, on enlarged scale, showing interior mechanism.

Similar letters of reference indicate correspending parts in the drawings.

A represents a rubber tube called the stein This tube passes through the rim of the wheel and connects with the tire.

Within the tube A and closely fitting it is a hollow cylindrical metallic tube B, one end-of which is threaded and receives the plug C, which is screwed into it, the shoulder of plug O and the end of cylinder B forming an airtight union. Through the plug C is a hole K, terminating in the small hole I, which opens into the chamber L. The plug O has an inner thread which receives the plug D, which screws into it, the shoulder of D and end of O forming an air-tight union. inder B is a plug or pin F, the middle portion of which nearly fills the chamber M. Both ends of plug F are reduced in size, as shown. One end of the plug Fis encircled bya short piece of rubber tubing E, which fits tightly over it. The other end of plugF is encircled by spiral spring G, which tends `to push the plug F forward and press the tube E against the cone-shaped point of the plug C, thus forming an air-tight chamber L within tube E. When the tire is to be inflated the plug D is removed and the tube of the air-pump inserted in its place. As the air passes through K and I into chamber L the tube E and plug F are forced back against spring G and the air passes on through chamber M and Within the cylf hole J into chamber N and enters the tire. After the tire is filled and the pumping stopped, the tube E is again pressed by spring G against the cone-shaped point of the plug C and prevents the air from escaping. It will readily be seen by the construction of this valve all of the interior mechanism can be removed and repairs made without taking the cylinder B out of stem A, as is necessary in the case of most other valves, although undesirable to do so. In order to deflate the tire the plug D is removed and a wire or pin passed through K and I and pressed against the end of pin F, which should have an indent H to receive the end ofwire and prevent it from slipping against and injuring the tube E.

Heretot'ore in most valves for cycle-tires airtight joints are formed by subjecting a piece of rubber or other material to severe pressure. This soon makes it hard and destroys its pliability. It is evident that such is not the Case with my valve. The end of tube E is pressedv with Yyielding pressure against the cone-point of plug O. This contact slightly stretches the mouth of the tube, and the back pressure of the air upon the outside of th`e tube E closes it down firmly upon the conepoint and prevents escape of air Without the severe mechanical pressure generally ein-- ployed. It will readily be seen that this construction, whereby the elastic quality of rubber or other material is utilized in the manner indicated by contact of tube E with plug C, is a radical departure from the construction of other valves and has the advantages alreadynamed. Itisevidentthat manymodiiications of this valve may be made without departing from my invention. In fact, the spring G is not strictly necessary, as the pin F can be extended to the inner end of chamber M. In that case, as the air enters from the pump the mouth of tube Eopens and admits the air. A soft, pliable, hollow heinisphere and a convex valve-seat, or a convex vvalve-seat and a soft elastic strip stretched over it, or numerous other modifications may be substituted for the cone Gand the tube E. I do not, therefore, confine myself to this exact construction; but,

ILO

Having described my invention, what I do claim as new, and desire t0 @over by Letters Patent', is

l. In a valve for the purpose specified, the combination of a cone shaped or convex valve seat and a soft pliable non-compressed, tube which is detached from its seat substantially as shown.

2. In a valve for the purpose specified, a cylinder of metal or other suitable material having a plug secured to its outer end the inner end of the said plug forming a valve seat in combination with a soft pliable tube 

